Speed boat



J. PLUM SPEED BOAT Filed Oct.

Oct; 21, 1930.

17, 1928 2 Sheets-Sheet 1 ENTOR J. PLUM SPEED BOAT Filed Oct. 17, 1928 2 Sheets-Sheet 2 mvsgsron ATTORNEY Patented oci zi, 1930 t by the boat; means for efficiently retaining the T .'Y-ST TES J'OHANNES PLUM, or nEw YoR I s gns]: Boar sistance tostrains ;'the provision of means for elevating and loweringthe fan shaped hydroplane element at the stern of the boat to trim the boat to the :most favorable planing angle in accordance with the Weightor load carried said'fan shaped hydroplane element in its adjusted position; and-the provision of yielding connections between-the hydroplane and boat stern, which, While positive, will per mit moderate relative movement. approximately horizontal planes: u T The improvement in, the forward planing surface consists of a modification in the bottom ofthe hull of-the boat above which the motor is located; It has beenfound that at high speed or in rough Water the ,pounding efi'ect from the impact of the bottom of the hull with the water causes a loosening and separation ofthe said bottom and upwardly extending sides of'thehull at-the point where I they meet. To overcome this the present hull is formed with the outer-portion thereofof the usual'contour which is designed forthe best results in speed boats, and aninner shell in the shape of an inverted arch between which and the outerportion theremay be a filling of anylight but firm materiah'such'as balsa wood. 7 .o I :These important features are" attained by the novel design, construction and arrangement of parts hereinafterjdescribed and il- 'lustrated in the accompanying drawing, forming .a material .part hereof and in .Whl0h2 v s I v I Figure. 1 is aside-elevational view of an "embodiment of the invention as disposed with relation'to the surface of water. I

Figure 2 is a topplan view :of the'same.

ats of. the. hydro- I Figure 3 is. an enlarged view taken 011-11116 3-3 of Figure 1; -;-F;igure l is a similar H ofFigure 1; Figure 5 is a further e side View of the stern,,parts i being broken view taken Ton line larged fragmentary transverse sectional Q j away andjother partsin section'to. showthe i construction.

Figure 6 is a fragmentary nside; elevational view of the hydroplane supporting piston, partially in section. Figure '7 is a partial- View of thepiston rod droplane. I I v 1t 1 Figure 8. is a frontelevational view of the same; partiallyin section. 1 r

side, partial sectional 1 asattached todthe 11y,-

The boat'as shown herewith, is generally 7 designated by the numeral 1 0, and is provided with a cockpit 11, in its central portion for the occupants. r s Y Extending centrally from'the bowlto..,a point somewhat in excess of half the'length of the. boat, is a keel 12, having at eachfside angular planing surfaces 13, forming an underbody having. straight upturnedxlateral sides of the boat 10.;

edges merged intothe I Extending from side to 'si'de of the vhull of the boat and spaceda's'hort distance above I the outside bottom of the hull a'second wall 7 inverted arch is located, the

in-the shape of an space therebetweenbeing filled with any preferred light but. firm-material 14, such as balsa wood or thelike. The ends of this'inw ner wall being curved wherethey meetjthe side walls 10 of the hull, serveuto braceand' strengthen "all this section of the boat. In actual I I that the pounding on the bottom of the hull caused by the impact of the, boat with the unyielding surface of the water, would re practice it has: been demonstrated suit in thebreakingvalway and forcing .u'pe V struction has obviated this diificultyand' p ventedvthe'said breaking away'and separaisideportions of the I t tion of thebottom' and hull;

side walls as shown, 'and-,itis to be noted that wardly and inside the boat of the outer ends of the hullbottom 13; This new'type of con- The rearward portion of .7 lei-ably :arcuate. in cross section} with raised g I a distinct line of demarkation formed, 7 through the shouldered portion of which extends aepropeller shaft 16. V a

The rear end of the propeller shaft has an outboard'bearing in a rudder 17, adjacent to' which is a propeller 18, the shaft being driven by a motor, not shown, carried in the V ,boat as is customary.

It is to be'noted thatthe shaft extends I downwardly at a conslderable angle sothat the propeller is completely submerged well 7 under the rear portion ofthe boat.

Below the stern the boat bottom, at the outergend' iof which is a roller mounted at the endfor" a plunger 7 21 pressed downwardly normally by a rea precisely horizontal plane,

"the boat rolls 'orcareens the ,ance itself. 7 1 A head-26, provided with a centrallnlet the gland 29.

27 is bolted to the upper end of the cylinder and a port 28 is arranged near its contracted lower end, in which end isa packing held by Passing into 7 packing, is-a-piston rod 30 having at its inner end 'apiston 31, secured by a nut, this piston having a central, full diametered narrow portion 32 on both sides of which are angular, annular grooves 33, tapering outwardly to distinct shoulders 34 at the ends of the threaded portions in which are engaged rings 35, to impingeupon packings 36, such as leather, these packings having inreaching cylindrical flaps 36* adapted to be pressed outwardly "against the wall of the cylinder by any liquid 2 whichmay enter the grooves 33,as best seen 7 sides,

in Figure 6.7 r v V H The outer end of the'piston rod 30 is provided with a flange 37 having a plurality of angular bracesto stiffen thestructure.

' The flange 37 has upon its opposite upper round bottomed transverse grooves 38, and a fiat bottom to seat upon a resilient level cushion 39,'such as rubberinterposed be tween-it and the levelled upper surface of the 'iantail hydroplane 40, the'same having a recess- 41 to receive the cushion element,39.. i

The hydroplane is essentially fan shaped in outline and capable ofpivoting on'the axis of the piston rod 30, and'also rising to the i The hydroplaneis secured to the flange 37 by clamps-42, set in transverse recesses 43, in

its under side, these clampshavingpaired rods a recess 19 isformed in 23 are rigidly mounted the cylinder 25, through the i 1 The foregolng 44 formed integrally near its ends, these rods extending through openings in the cushion 39 and flange. 37 to pass through corresponding openings in the ends of clamp bars 45 seated in the grooves 38, these bars being shaped to clearat theirends and are provided with nutS46-f -q.

The bars 45 are sufficiently narrow and arovided with rounded loweredges tofseat in the recesses 38, which havei-at their outer ed'gesraised ledges 38, as best seen in Figures 7and8.-"

At a suitable point-inthe body oi the boat is atank 47;conta-1ning compressed air-from any" convenient source, and leading from the tankl are connections to valves? 48-49, controllingpi-pes 50-51, leading respectively to the cylinder parts 28- 27, between which the piston-31 operates 1 I A liquid packing, such asoil, gl'ycerine, etc, is 1 entered into the cylinder above the piston 31 andp'acking element-29,:as at 52 53 in Figure 5. V v i ii i,

The valves 485 49 are of the three way'type and arranged to :be controlled :by-handles 48 18"; and 49 -499, byI-which air may be,

admitted under a very considerable pressure into the cylinder, ina manner-to raise and lower the piston, and consequently the fantail hydroplane, maintaining it at the height foundtobecalculatedto obtainthe'bestplan- 7 3 g or the boat with relation to the weight and load carriedthereby Obviously, the piston,the air on the other "side must be allowed to escape, which is accomplished by the type of valves used. I 1 i disclosure is to be regarded as descriptive. and villustrative only,1and not as restrictive or'limitative :of the invention,

of which obviouslyan embodiment may be constructed including" many modifications without departing herein indicated and denoted in the appended claims. 7

Having thus described the invention, what is claimed 'as new and desired to' secure by LettersPatentis-if Y *1. A boat havinga of arcuate cross section throughout its length,- a keel, a bottom composed of flat plates'angularly disposed andconve'rging at the keel,-side plates joining. said bottom and merginginto the sides of said hull','said bottom having a' shouldered v step reaching to the hull at a point midway the length 'oiitheyboat, anda filler between said botto-m'and hull. l

' 2. A boat having a hull of arcuatecross section throughout its length, akeel, a bottom composed of flat plates angularlydisposed and converging at the keel, side plates joining as air: is admitted to one side of V from the general scope said: bottom andmergingf into the s ides of 5 said hull,;a stepped shoulder. at the end of said bottom extending; to the hull,iand a L16,

I joining said bottom'an'd merging into thesides of said hull, .a stepped shoulder at the end of said bottom extending to'the hull, a firm light Weight substance interposed-be tween the bottom and -hull, a recess in the underside of said hull adjacentthe sternofthe boat, and a hydroplane pivoted to rotate free- 'ly below and rearward of the stern recess. 4 V Y the stern,;'a rotatable hydroplane' havinga a the boat, and means "for raising' andlowering 4. --A boat having a recess in its bottom at to preventfthe loss of air from said cylinder. 9. A speed boat hydroplane adjusting means comprising a ,for-wardly inclined cylinder at'the stern of the boat, a piston oper l 70';- plane yieldlngly mounted on the lower end 3 'of the' piston rod, means for-adjusting the able therein, afan-shaped rotatable hydro:

piston in v said'cylinder', and a resiliently .mountedrollr to impinge on the upper surface of said" hydroplane, said piston and by i droplane being capable of movement in the plane of-the axis "of said cylinder,

fixed my signature.

fan-like contour, said hydroplane being par tially disposed in the stern recess, a pivotally mounted stem for said hydroplane,saidstem being at an; angle to the horizontal plane of the hydroplane. g Y. ,7

5. A speed boat hydroplane adjusting means comprising a bracket fixed on the floor of the boat, a cylinder fixed in the bracket and inclined at approximately an angle of ten degrees to the vertical, a piston movable in said cylinder,.means to adjust the height of said piston, a' rotatable hydroplane', and a piston rod having a flanged end fixed to said hydro-plane. j

6. A speed boat hydroplane adjusting means comprising a forwardly inclined} bracket on the boat fioor adjacent the stern, g a hydroplane having arecess with aleveled I bottom'in its upper surface, a flange se-' cured in the recess, a cushion element interposed, a piston havlng a rod fixed tO' SZLICl flange, an 1nclined cylinder carriedby said bracket to receive said piston, ports said, cylinder above and below said piston, and) controllable means for admitting a gaseous body through said ports.

7. A speed boat hydroplane adjusting means comprising a forwardly inclined cyl inder at the stern of'the boat, a piston operable therein, said piston having packings adapted to prevent the passage of air, arod. l

in said piston, a rotatablehydroplane fixed at the lower end of said rod, liquid packings in said cylinder at the rod and abovethe piston, a sourceof compressed air, and valves to controlthe admissionandexhaust of the air to either side of said piston. 8. A speed boat hydroplane adjusting 7 means comprising a forwardly inclined cyl- I inder at the stern'fot the boat, a piston operv able therein, saidpiston having pa'ckings adapted to prevent the passage of air,a rod in said piston, a 'liydroplane yieldinglyf mounted on saidrod to raise, lower and pivot therewith, a source of compressed air connected with said, cylinder above'an d below the piston, manual means for controlling'the ingress and egress of air thereto,an'd means 7 i'lntestimony whereof I have hereunto-fat JOHANNES rLUM c 8 0 

